Using Waste Heat for Sustainable Manufacturing Based on the Example of a Conventional Industrial Bakery

Schwabe, K.; Walsdorf-Maul, Manuela; Schaudienst, F.; Vogdt, Frank U.

doi:10.7763/ijmmm.2013.v1.58

Cited by 1 publication

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“…The dissipation of thermal energy from industrial facilities during production processes is and has been a challenging issue worldwide. Flue gases from industrial processes constitute around 20% of the total dissipated energy [1][2][3]. Water vapour, as a part of the flue gas, carries latent heat, which can be recovered.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Concepts to Increase the Dew Point Temperature for Thermal Energy Recovery from Flue Gas, Using Aspen®

et al. 2019

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Thermal energy of flue gases (FG) dissipating from industrial facilities into the environment, constitute around 20% of the total dissipated thermal energy. Being part of the FG, water vapour carries thermal energy out of the system in the form of the latent heat, which can be recovered by condensation, thus increasing the overall efficiency of an industrial process. The limiting factor in this case is the low dew point temperature (usually 40-60 • C) of the water vapour in the FG. The increase of the dew point temperature can be achieved by increasing the water content or pressure. Taking these measures as a basis, the presented work investigated the following concepts for increasing the dew point temperature: humidification of the flue gas using water, humidification using steam, compression of the FG and usage of the steam ejector. Modelling of these concepts was performed using the commercial software Aspen ® . The humidification of the FG using water resulted in the negligible increase in the dew point (3 • C). Using steam humidification the temperatures of up to 92 • C were reached, while the use of steam ejector led to few degrees higher dew point temperatures. However, both concepts proved to be energy demanding, due to the energy requirements for the steam generation. The FG compression enabled the achievement of a 97 • C dew point temperature, being both energy-efficient and exhibiting the lowest energy cost. Energies 2019, 12, 1585 2 of 17 Energies 2019, 12, 1585 13 of 17repair costs of the compressor are normally higher than the equipment used in the other proposed concepts and should be taken into account in the future work.

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Section: Introductionmentioning

confidence: 99%